Diagnostic Aids

WARNING: This page is about a different car, the 2011 GMC Yukon, 2011 Chevrolet Tahoe, and 2011 Cadillac Escalade. However, it is still accessible from the selected car via links, so may be relevant.

Ensure the transmission pass through connector and harness terminals are clean and not damaged, and the charging system is functioning correctly.
The transmission X176 24-way inline harness connector must be disconnected prior to disconnecting the transmission X1 16-way inline harness connector